amazing_elixir.ex

defp check_access(conn) do
  parsed_body = with {:ok, response} <- HTTPoison.get(url, header_with_authorization(conn)),
                     200 <- response.status_code,
                 do: Poison.Parser.parse(response.body)

  case parsed_body do
   {:ok, %{"super_admin" => _} = body} ->
     {:ok, body}
   _ ->
     {:error, "User not authorized"}
  end
end

With Elixir 1.3 this code would look like this:

defp check_access(conn) do
  with {:ok, %{status_code: 200} = response} <- HTTPoison.get(url, header_with_authorization(conn)),
       {:ok, %{"super_admin" => _} = body} <- Poison.Parser.parse(response.body) do
    {:ok, body}
  else
    _ -> {:error, "User not authorized"}
  end
end